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The Java implementation initially consisted of just an [[interpreter (computing)|interpreter]], but a compiler to [[Java bytecode]] was later added. This compiler only worked on certain procedures. The Java version of Factor was replaced by a version written in C and Factor. Initially, this consisted of just an interpreter, but the interpreter was replaced by two compilers, used in different situations. Over time, the Factor implementation has grown significantly faster.<ref>{{cite web | url = http://concatenative.org/wiki/view/Factor/Implementation%20history | title = Concatenative.org wiki: Factor/Implementation History}}</ref>
==Description==
Factor is a [[dynamically typed]], [[functional programming|functional]] and [[object-oriented programming|object-oriented]] [[programming language]]. Code is structured around small procedures, called words. In typical code, these are 1–3 lines long, and a procedure more than 7 lines long is very rare. Something that would idiomatically be expressed with one procedure in another programming language would be written as several words in Factor.<ref name="dls">{{cite journal |last1=Pestov |first1=Sviatoslav |last2=Ehrenberg |first2=Daniel |year=2010 |title=Factor: a dynamic stack-based programming language |journal=ACM SIGPLAN Notices |volume=45 |issue=12 |pages=43–58 |publisher=ACM |doi=10.1145/1899661.1869637 }}</ref>
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